Barre of upper limbs: symptoms and causes

2021-01-26 12:00 AM

When vision is removed, weak motor neurons cause the limb to fall. The falling arm is more sensitive than using a single force test to identify weak motor neurons.

Description

An asymmetrical fall in the arms when the patient stretches the arms in a tilted position (eg. Palm up) with the eyes closed and completely in the same position. The forearms fall, the forearms are bent, and the typical wrist and elbow flexion begins from a distance and progresses closer.

Causes

Common

Brain infarction.

Brain hemorrhage.

Neck marrow injury.

Less common

Infarction hole, posterior branch inside.

Multiple sclerosis.

Mass lesions (eg. Tumor, abscess, AVM venous artery malformation).

Arm falls flat: Left-hand falls outward and rotates inward

Central motor neuron anatomy

Mechanism

When vision is removed, weak motor neurons cause the limb to fall.

Meaning

The falling arm is more sensitive than using a single force test to identify weak motor neurons.

 

Sensitivity

Specificity

Positive LR

Negative LR

The arm fell flat

79–92%

90–98%

10.3

0.1


Board. Clinical utility of the arm falls flat in the unilateral lesion of the brain